Nowadays they are asking for Rukhsati pictures along with several other proofs and supporting documents of the relationship. They don't just care if you are married, they want to see how strong your relationship is after and before the marriage. I would strongly suggest for Rukhsati if she wants to avoid uncertainity and dissappointment with the immigration process.
This is one of my previous posts, it might help:
The duration of this whole process depends on three factors:
1) Number of applications
2) Embassy Staff (Number of staff and efficiency)
3) Strength of your case (Sufficient proof of relationship and marriage)
The first two factors can't be controlled by us. But the third factor is definitely in our hands. Remember now they look for sufficient proof of relationship and not just a marraige certificate/Nikah nama and the wedding pictures. Now they are more interested in the constant communication proof such as Phone bills (call durations & text messaging), emails, online gift receipts, webchat logs (msn, skype), financial support, restaurant/hotel receipts. It would help your case if you show them pictures of cohabitation after marriage if there was any. Valima (Reception) pictures help alot along with Rukhsati pictures. Rukhsati is very important as now they don't issue a Visa without rukhsati.
So just make sure you submit all these proofs if you havn't submitted them yet. You can send out these supporting documents voluntarily. This way it becomes easier for you to prove the relationship to the decision making officer and you get your visa much quicker.
If the decision making officer doesn't think that enough proof of relationship is provided, he would put your file on the side and ask for more proof which would take alot of your time if you don't have it and in some cases you have to go for an interview if there is not enough evidence of relationship.